Double Efficiency

    The Double Efficiency was perhaps the pinnacle of engine development by Fuller & Johnson.  Two different designs were used on these engines which were introduced in 1905.  The big 8, 10, 12, 16, 18 and 20 hp engines were of sideshaft design.  3, 5, 7 and 9 hp engines used a push rod design, all had ignitor ignition.  A 4 and 6 hp, the 6 hp being an oil cooled engine with a water hopper cast into the cylinder, were available until 1906.  The DE engines were well built and very smooth running.  Because of this the cost of manufacture was high, too high for the company to stay in business. In 1912 a new series was introduced and by 1913, few DE engines were built.

Fuller & Johnson's only sideshaft engine.  Heavy construction is evident in the photo.

All DE engines were available on a steel team truck.  

A combination feed grinder and wood saw on team trucks powered by a 6hp DE.  Note that this is an oil cooled based engine with a cast on water hopper.

A mid size DE factory portable engine.  

An 18 hp DE factory portable engine.

The same engine running a feed grinder on a farm near Madison, WI.